Patent US3572252A successfully refreshed from Google Patents.
US3572252A
Expired / Lapsed
US
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Covered railway hopper car
Assignee: Pullman Standard Inc
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Filing: 1968-01-02
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Granted: 1971-03-23
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Expires: 1988-01-02
Abstract
Abstract A RAILROAD HOPPER CAR COMPRISING INTEGRAL ROOF AND SIDE STRUCTURES OF EXTRUDED ALUMINUM WELDED TO COMPARTMENT STRUCTURES OF EXTRUDED ALUMINUM TO DEFINE A PLURALITY OF HATCH-TYPE HOPPER AREAS, EACH OF THE STRUCTURES BEING A UNIT SHEET WITH PERPENDICULARLY PROJECTED STIFFENERS TO DEFINE THE SIDE SHEETING AND SIDEPOSTS, THE STRUCTURES BEING HELD TOGETHER BY WELDMENTS AND WHEREIN THERE IS ALSO PROVIDED EXTRUDED BOLSTER STRUCTURE AND DRAFT SILL CONSTRUCTION AT THE ENDS OF THE CAR CENTER SILL.
Inventors
- 👤 Kenneth P Coover
- 👤 William Van Der Sluys
- 👤 Herbert S Wille
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:21
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |